Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since October 24, 2025.
CVE-2025-59287
Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
Added to KEV October 24, 2025
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2025-59287
- CWE
- CWE-502
- Affected products
- Windows · Microsoft Windows · Microsoft
What happened
Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.
What it means for your business
Microsoft Windows is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-59287). Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution. CISA remediation due date: 2025-11-14. If you need help checking exposure, call (864) 335-9223.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: November 14, 2025
Sources
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